__wait_on

函数名称：To allow interruptible waiting and asynchronous (i.e. nonblocking)* waiting, the actions of __wait_on_bit() and __wait_on_bit_lock() are* permitted return codes. Nonzero return codes halt waiting and return.

函数原型：int __sched __wait_on_bit(struct wait_queue_head *wq_head, struct wait_bit_queue_entry *wbq_entry, wait_bit_action_f *action, unsigned mode)

返回类型：int

参数：

类型	参数	名称
struct wait_queue_head *	wq_head
struct wait_bit_queue_entry *	wbq_entry
wait_bit_action_f *	action
unsigned	mode

ret等于0

循环

Note: we use "set_current_state()" _after_ the wait-queue add,* because we need a memory barrier there on SMP, so that any* wake-function that tests for the wait-queue being active* will be guaranteed to see waitqueue addition _or_ subsequent

如果st_bit - Determine whether a bit is set*@nr: bit number to test*@addr: Address to start counting from则ret = ( * action)( & key, mode)

当st_bit - Determine whether a bit is set*@nr: bit number to test*@addr: Address to start counting from且非ret 循环

sh_wait - clean up after waiting in a queue*@wq_head: waitqueue waited on*@wq_entry: wait descriptor* Sets current thread back to running state and removes* the wait descriptor from the given waitqueue if still* queued.

返回:ret

**调用者**
名称	描述
out_of_line_wait_on_bit
out_of_line_wait_on_bit_timeout
__inode_wait_for_writeback	Wait for writeback on an inode to complete. Called with i_lock held.* Caller must make sure inode cannot go away when we drop i_lock.

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告